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feat(dns): add parallel query (#5239)

pull/5325/head
Meow 2025-11-21 13:45:42 +08:00 committed by GitHub
parent cd51f57535
commit f14fd1cbee
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
14 changed files with 422 additions and 121 deletions
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4
app/dns/cache_controller.go
View File

@ -194,7 +194,7 @@ func (c *CacheController) migrate() {
return
}
errors.LogDebug(context.Background(), c.name, " starting background cache migration for ", len(dirtyips), " items.")
errors.LogDebug(context.Background(), c.name, " starting background cache migration for ", len(dirtyips), " items")
batch := make([]migrationEntry, 0, migrationBatchSize)
for domain, recD := range dirtyips {
@ -214,7 +214,7 @@ func (c *CacheController) migrate() {
c.dirtyips = nil
c.Unlock()
errors.LogDebug(context.Background(), c.name, " cache migration completed.")
errors.LogDebug(context.Background(), c.name, " cache migration completed")
}
func (c *CacheController) flush(batch []migrationEntry) {

151
app/dns/config.pb.go
View File

@ -147,6 +147,7 @@ type NameServer struct {
FinalQuery bool `protobuf:"varint,12,opt,name=finalQuery,proto3" json:"finalQuery,omitempty"`
UnexpectedGeoip []*router.GeoIP `protobuf:"bytes,13,rep,name=unexpected_geoip,json=unexpectedGeoip,proto3" json:"unexpected_geoip,omitempty"`
ActUnprior bool `protobuf:"varint,14,opt,name=actUnprior,proto3" json:"actUnprior,omitempty"`
PolicyID uint32 `protobuf:"varint,17,opt,name=policyID,proto3" json:"policyID,omitempty"`
}
func (x *NameServer) Reset() {
@ -291,6 +292,13 @@ func (x *NameServer) GetActUnprior() bool {
return false
}
func (x *NameServer) GetPolicyID() uint32 {
if x != nil {
return x.PolicyID
}
return 0
}
type Config struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -312,6 +320,7 @@ type Config struct {
QueryStrategy QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
DisableFallback bool `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
DisableFallbackIfMatch bool `protobuf:"varint,11,opt,name=disableFallbackIfMatch,proto3" json:"disableFallbackIfMatch,omitempty"`
EnableParallelQuery bool `protobuf:"varint,14,opt,name=enableParallelQuery,proto3" json:"enableParallelQuery,omitempty"`
}
func (x *Config) Reset() {
@ -414,6 +423,13 @@ func (x *Config) GetDisableFallbackIfMatch() bool {
return false
}
func (x *Config) GetEnableParallelQuery() bool {
if x != nil {
return x.EnableParallelQuery
}
return false
}
type NameServer_PriorityDomain struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -599,7 +615,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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@ -646,70 +662,75 @@ var file_app_dns_config_proto_rawDesc = []byte{
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}
var (

3
app/dns/config.proto
View File

@ -37,6 +37,7 @@ message NameServer {
bool finalQuery = 12;
repeated xray.app.router.GeoIP unexpected_geoip = 13;
bool actUnprior = 14;
uint32 policyID = 17;
}
enum DomainMatchingType {
@ -89,4 +90,6 @@ message Config {
bool disableFallback = 10;
bool disableFallbackIfMatch = 11;
bool enableParallelQuery = 14;
}

256
app/dns/dns.go
View File

@ -25,6 +25,7 @@ type DNS struct {
sync.Mutex
disableFallback bool
disableFallbackIfMatch bool
enableParallelQuery bool
ipOption *dns.IPOption
hosts *StaticHosts
clients []*Client
@ -157,6 +158,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
matcherInfos: matcherInfos,
disableFallback: config.DisableFallback,
disableFallbackIfMatch: config.DisableFallbackIfMatch,
enableParallelQuery: config.EnableParallelQuery,
checkSystem: checkSystem,
}, nil
}
@ -235,45 +237,11 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
}
// Name servers lookup
var errs []error
for _, client := range s.sortClients(domain) {
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
errors.LogDebug(s.ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
continue
}
ips, ttl, err := client.QueryIP(s.ctx, domain, option)
if len(ips) > 0 {
if ttl == 0 {
ttl = 1
}
return ips, ttl, nil
}
errors.LogInfoInner(s.ctx, err, "failed to lookup ip for domain ", domain, " at server ", client.Name())
if err == nil {
err = dns.ErrEmptyResponse
}
errs = append(errs, err)
if client.IsFinalQuery() {
break
}
if s.enableParallelQuery {
return s.parallelQuery(domain, option)
} else {
return s.serialQuery(domain, option)
}
if len(errs) > 0 {
allErrs := errors.Combine(errs...)
err0 := errs[0]
if errors.AllEqual(err0, allErrs) {
if go_errors.Is(err0, dns.ErrEmptyResponse) {
return nil, 0, dns.ErrEmptyResponse
}
return nil, 0, errors.New("returning nil for domain ", domain).Base(err0)
}
return nil, 0, errors.New("returning nil for domain ", domain).Base(allErrs)
}
return nil, 0, dns.ErrEmptyResponse
}
func (s *DNS) sortClients(domain string) []*Client {
@ -300,6 +268,9 @@ func (s *DNS) sortClients(domain string) []*Client {
clients = append(clients, client)
clientNames = append(clientNames, client.Name())
hasMatch = true
if client.finalQuery {
return clients
}
}
if !(s.disableFallback || s.disableFallbackIfMatch && hasMatch) {
@ -311,6 +282,9 @@ func (s *DNS) sortClients(domain string) []*Client {
clientUsed[idx] = true
clients = append(clients, client)
clientNames = append(clientNames, client.Name())
if client.finalQuery {
return clients
}
}
}
@ -322,14 +296,214 @@ func (s *DNS) sortClients(domain string) []*Client {
}
if len(clients) == 0 {
clients = append(clients, s.clients[0])
clientNames = append(clientNames, s.clients[0].Name())
errors.LogDebug(s.ctx, "domain ", domain, " will use the first DNS: ", clientNames)
if len(s.clients) > 0 {
clients = append(clients, s.clients[0])
clientNames = append(clientNames, s.clients[0].Name())
errors.LogWarning(s.ctx, "domain ", domain, " will use the first DNS: ", clientNames)
} else {
errors.LogError(s.ctx, "no DNS clients available for domain ", domain, " and no default clients configured")
}
}
return clients
}
func mergeQueryErrors(domain string, errs []error) error {
if len(errs) == 0 {
return dns.ErrEmptyResponse
}
var noRNF error
for _, err := range errs {
if go_errors.Is(err, errRecordNotFound) {
continue // server no response, ignore
} else if noRNF == nil {
noRNF = err
} else if !go_errors.Is(err, noRNF) {
return errors.New("returning nil for domain ", domain).Base(errors.Combine(errs...))
}
}
if go_errors.Is(noRNF, dns.ErrEmptyResponse) {
return dns.ErrEmptyResponse
}
if noRNF == nil {
noRNF = errRecordNotFound
}
return errors.New("returning nil for domain ", domain).Base(noRNF)
}
func (s *DNS) serialQuery(domain string, option dns.IPOption) ([]net.IP, uint32, error) {
var errs []error
for _, client := range s.sortClients(domain) {
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
errors.LogDebug(s.ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
continue
}
ips, ttl, err := client.QueryIP(s.ctx, domain, option)
if len(ips) > 0 {
return ips, ttl, nil
}
errors.LogInfoInner(s.ctx, err, "failed to lookup ip for domain ", domain, " at server ", client.Name(), " in serial query mode")
if err == nil {
err = dns.ErrEmptyResponse
}
errs = append(errs, err)
}
return nil, 0, mergeQueryErrors(domain, errs)
}
func (s *DNS) parallelQuery(domain string, option dns.IPOption) ([]net.IP, uint32, error) {
var errs []error
clients := s.sortClients(domain)
resultsChan := asyncQueryAll(domain, option, clients, s.ctx)
groups, groupOf := makeGroups( /*s.ctx,*/ clients)
results := make([]*queryResult, len(clients))
pending := make([]int, len(groups))
for gi, g := range groups {
pending[gi] = g.end - g.start + 1
}
nextGroup := 0
for range clients {
result := <-resultsChan
results[result.index] = &result
gi := groupOf[result.index]
pending[gi]--
for nextGroup < len(groups) {
g := groups[nextGroup]
// group race, minimum rtt -> return
for j := g.start; j <= g.end; j++ {
r := results[j]
if r != nil && r.err == nil && len(r.ips) > 0 {
return r.ips, r.ttl, nil
}
}
// current group is incomplete and no one success -> continue pending
if pending[nextGroup] > 0 {
break
}
// all failed -> log and continue next group
for j := g.start; j <= g.end; j++ {
r := results[j]
e := r.err
if e == nil {
e = dns.ErrEmptyResponse
}
errors.LogInfoInner(s.ctx, e, "failed to lookup ip for domain ", domain, " at server ", clients[j].Name(), " in parallel query mode")
errs = append(errs, e)
}
nextGroup++
}
}
return nil, 0, mergeQueryErrors(domain, errs)
}
type queryResult struct {
ips []net.IP
ttl uint32
err error
index int
}
func asyncQueryAll(domain string, option dns.IPOption, clients []*Client, ctx context.Context) chan queryResult {
if len(clients) == 0 {
ch := make(chan queryResult)
close(ch)
return ch
}
ch := make(chan queryResult, len(clients))
for i, client := range clients {
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
errors.LogDebug(ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
ch <- queryResult{err: dns.ErrEmptyResponse, index: i}
continue
}
go func(i int, c *Client) {
qctx := ctx
if !c.server.IsDisableCache() {
nctx, cancel := context.WithTimeout(context.WithoutCancel(ctx), c.timeoutMs*2)
qctx = nctx
defer cancel()
}
ips, ttl, err := c.QueryIP(qctx, domain, option)
ch <- queryResult{ips: ips, ttl: ttl, err: err, index: i}
}(i, client)
}
return ch
}
type group struct{ start, end int }
// merge only adjacent and rule-equivalent Client into a single group
func makeGroups( /*ctx context.Context,*/ clients []*Client) ([]group, []int) {
n := len(clients)
if n == 0 {
return nil, nil
}
groups := make([]group, 0, n)
groupOf := make([]int, n)
s, e := 0, 0
for i := 1; i < n; i++ {
if clients[i-1].policyID == clients[i].policyID {
e = i
} else {
for k := s; k <= e; k++ {
groupOf[k] = len(groups)
}
groups = append(groups, group{start: s, end: e})
s, e = i, i
}
}
for k := s; k <= e; k++ {
groupOf[k] = len(groups)
}
groups = append(groups, group{start: s, end: e})
// var b strings.Builder
// b.WriteString("dns grouping: total clients=")
// b.WriteString(strconv.Itoa(n))
// b.WriteString(", groups=")
// b.WriteString(strconv.Itoa(len(groups)))
// for gi, g := range groups {
// b.WriteString("\n [")
// b.WriteString(strconv.Itoa(g.start))
// b.WriteString("..")
// b.WriteString(strconv.Itoa(g.end))
// b.WriteString("] gid=")
// b.WriteString(strconv.Itoa(gi))
// b.WriteString(" pid=")
// b.WriteString(strconv.FormatUint(uint64(clients[g.start].policyID), 10))
// b.WriteString(" members: ")
// for i := g.start; i <= g.end; i++ {
// if i > g.start {
// b.WriteString(", ")
// }
// b.WriteString(strconv.Itoa(i))
// b.WriteByte(':')
// b.WriteString(clients[i].Name())
// }
// }
// errors.LogDebug(ctx, b.String())
return groups, groupOf
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))

9
app/dns/nameserver.go
View File

@ -20,6 +20,9 @@ import (
type Server interface {
// Name of the Client.
Name() string
IsDisableCache() bool
// QueryIP sends IP queries to its configured server.
QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, uint32, error)
}
@ -38,6 +41,7 @@ type Client struct {
finalQuery bool
ipOption *dns.IPOption
checkSystem bool
policyID uint32
}
// NewServer creates a name server object according to the network destination url.
@ -199,6 +203,7 @@ func NewClient(
client.finalQuery = ns.FinalQuery
client.ipOption = &ipOption
client.checkSystem = checkSystem
client.policyID = ns.PolicyID
return nil
})
return client, err
@ -209,10 +214,6 @@ func (c *Client) Name() string {
return c.server.Name()
}
func (c *Client) IsFinalQuery() bool {
return c.finalQuery
}
// QueryIP sends DNS query to the name server with the client's IP.
func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, uint32, error) {
if c.checkSystem {

4
app/dns/nameserver_cached.go
View File

@ -28,12 +28,12 @@ func queryIP(ctx context.Context, s CachedNameserver, domain string, option dns.
ips, ttl, err := merge(option, rec.A, rec.AAAA)
if !go_errors.Is(err, errRecordNotFound) {
if ttl > 0 {
// errors.LogDebugInner(ctx, err, cache.name, " cache HIT ", fqdn, " -> ", ips)
errors.LogDebugInner(ctx, err, cache.name, " cache HIT ", fqdn, " -> ", ips)
log.Record(&log.DNSLog{Server: cache.name, Domain: fqdn, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
return ips, uint32(ttl), err
}
if cache.serveStale && (cache.serveExpiredTTL == 0 || cache.serveExpiredTTL < ttl) {
// errors.LogDebugInner(ctx, err, cache.name, " cache OPTIMISTE ", fqdn, " -> ", ips)
errors.LogDebugInner(ctx, err, cache.name, " cache OPTIMISTE ", fqdn, " -> ", ips)
log.Record(&log.DNSLog{Server: cache.name, Domain: fqdn, Result: ips, Status: log.DNSCacheOptimiste, Elapsed: 0, Error: err})
go pull(ctx, s, fqdn, option)
return ips, 1, err

7
app/dns/nameserver_doh.go
View File

@ -116,6 +116,11 @@ func (s *DoHNameServer) Name() string {
return s.cacheController.name
}
// IsDisableCache implements Server.
func (s *DoHNameServer) IsDisableCache() bool {
return s.cacheController.disableCache
}
func (s *DoHNameServer) newReqID() uint16 {
return 0
}
@ -130,7 +135,7 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
errors.LogInfo(ctx, s.Name(), " querying: ", fqdn)
if s.Name()+"." == "DOH//"+fqdn {
errors.LogError(ctx, s.Name(), " tries to resolve itself! Use IP or set \"hosts\" instead.")
errors.LogError(ctx, s.Name(), " tries to resolve itself! Use IP or set \"hosts\" instead")
if noResponseErrCh != nil {
noResponseErrCh <- errors.New("tries to resolve itself!", s.Name())
}

5
app/dns/nameserver_fakedns.go
View File

@ -20,6 +20,11 @@ func (FakeDNSServer) Name() string {
return "FakeDNS"
}
// IsDisableCache implements Server.
func (s *FakeDNSServer) IsDisableCache() bool {
return true
}
func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, opt dns.IPOption) ([]net.IP, uint32, error) {
if f.fakeDNSEngine == nil {
return nil, 0, errors.New("Unable to locate a fake DNS Engine").AtError()

5
app/dns/nameserver_local.go
View File

@ -35,6 +35,11 @@ func (s *LocalNameServer) Name() string {
return "localhost"
}
// IsDisableCache implements Server.
func (s *LocalNameServer) IsDisableCache() bool {
return true
}
// NewLocalNameServer creates localdns server object for directly lookup in system DNS.
func NewLocalNameServer() *LocalNameServer {
errors.LogInfo(context.Background(), "DNS: created localhost client")

8
app/dns/nameserver_quic.go
View File

@ -37,8 +37,6 @@ type QUICNameServer struct {
// NewQUICNameServer creates DNS-over-QUIC client object for local resolving
func NewQUICNameServer(url *url.URL, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) (*QUICNameServer, error) {
errors.LogInfo(context.Background(), "DNS: created Local DNS-over-QUIC client for ", url.String())
var err error
port := net.Port(853)
if url.Port() != "" {
@ -55,6 +53,7 @@ func NewQUICNameServer(url *url.URL, disableCache bool, serveStale bool, serveEx
clientIP: clientIP,
}
errors.LogInfo(context.Background(), "DNS: created Local DNS-over-QUIC client for ", url.String())
return s, nil
}
@ -63,6 +62,11 @@ func (s *QUICNameServer) Name() string {
return s.cacheController.name
}
// IsDisableCache implements Server.
func (s *QUICNameServer) IsDisableCache() bool {
return s.cacheController.disableCache
}
func (s *QUICNameServer) newReqID() uint16 {
return 0
}

9
app/dns/nameserver_tcp.go
View File

@ -52,6 +52,7 @@ func NewTCPNameServer(
), nil
}
errors.LogInfo(context.Background(), "DNS: created TCP client initialized for ", url.String())
return s, nil
}
@ -66,6 +67,7 @@ func NewTCPLocalNameServer(url *url.URL, disableCache bool, serveStale bool, ser
return internet.DialSystem(ctx, *s.destination, nil)
}
errors.LogInfo(context.Background(), "DNS: created Local TCP client initialized for ", url.String())
return s, nil
}
@ -93,6 +95,11 @@ func (s *TCPNameServer) Name() string {
return s.cacheController.name
}
// IsDisableCache implements Server.
func (s *TCPNameServer) IsDisableCache() bool {
return s.cacheController.disableCache
}
func (s *TCPNameServer) newReqID() uint16 {
return uint16(atomic.AddUint32(&s.reqID, 1))
}
@ -104,7 +111,7 @@ func (s *TCPNameServer) getCacheController() *CacheController {
// sendQuery implements CachedNameserver.
func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, fqdn string, option dns_feature.IPOption) {
errors.LogDebug(ctx, s.Name(), " querying DNS for: ", fqdn)
errors.LogInfo(ctx, s.Name(), " querying DNS for: ", fqdn)
reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, 0))

12
app/dns/nameserver_udp.go
View File

@ -54,6 +54,7 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
Execute: s.RequestsCleanup,
}
s.udpServer = udp.NewDispatcher(dispatcher, s.HandleResponse)
errors.LogInfo(context.Background(), "DNS: created UDP client initialized for ", address.NetAddr())
return s
}
@ -63,6 +64,11 @@ func (s *ClassicNameServer) Name() string {
return s.cacheController.name
}
// IsDisableCache implements Server.
func (s *ClassicNameServer) IsDisableCache() bool {
return s.cacheController.disableCache
}
// RequestsCleanup clears expired items from cache
func (s *ClassicNameServer) RequestsCleanup() error {
now := time.Now()
@ -92,7 +98,7 @@ func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_prot
ipRec, err := parseResponse(payload.Bytes())
payload.Release()
if err != nil {
errors.LogError(ctx, s.Name(), " fail to parse responded DNS udp")
errors.LogErrorInner(ctx, err, s.Name(), " fail to parse responded DNS udp")
return
}
@ -105,7 +111,7 @@ func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_prot
}
s.Unlock()
if !ok {
errors.LogError(ctx, s.Name(), " cannot find the pending request")
errors.LogErrorInner(ctx, err, s.Name(), " cannot find the pending request")
return
}
@ -155,7 +161,7 @@ func (s *ClassicNameServer) getCacheController() *CacheController {
// sendQuery implements CachedNameserver.
func (s *ClassicNameServer) sendQuery(ctx context.Context, _ chan<- error, fqdn string, option dns_feature.IPOption) {
errors.LogDebug(ctx, s.Name(), " querying DNS for: ", fqdn)
errors.LogInfo(ctx, s.Name(), " querying DNS for: ", fqdn)
reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, 0))

69
infra/conf/dns.go
View File

@ -206,6 +206,7 @@ type DNSConfig struct {
ServeExpiredTTL uint32 `json:"serveExpiredTTL"`
DisableFallback bool `json:"disableFallback"`
DisableFallbackIfMatch bool `json:"disableFallbackIfMatch"`
EnableParallelQuery bool `json:"enableParallelQuery"`
UseSystemHosts bool `json:"useSystemHosts"`
}
@ -405,6 +406,7 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
ServeExpiredTTL: c.ServeExpiredTTL,
DisableFallback: c.DisableFallback,
DisableFallbackIfMatch: c.DisableFallbackIfMatch,
EnableParallelQuery: c.EnableParallelQuery,
QueryStrategy: resolveQueryStrategy(c.QueryStrategy),
}
@ -415,11 +417,78 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
config.ClientIp = []byte(c.ClientIP.IP())
}
// Build PolicyID
policyMap := map[string]uint32{}
nextPolicyID := uint32(1)
buildPolicyID := func(nsc *NameServerConfig) uint32 {
var sb strings.Builder
// ClientIP
if nsc.ClientIP != nil {
sb.WriteString("client=")
sb.WriteString(nsc.ClientIP.String())
sb.WriteByte('|')
} else {
sb.WriteString("client=none|")
}
// SkipFallback
if nsc.SkipFallback {
sb.WriteString("skip=1|")
} else {
sb.WriteString("skip=0|")
}
// QueryStrategy
sb.WriteString("qs=")
sb.WriteString(strings.ToLower(strings.TrimSpace(nsc.QueryStrategy)))
sb.WriteByte('|')
// Tag
sb.WriteString("tag=")
sb.WriteString(strings.ToLower(strings.TrimSpace(nsc.Tag)))
sb.WriteByte('|')
// []string helper
writeList := func(tag string, lst []string) {
if len(lst) == 0 {
sb.WriteString(tag)
sb.WriteString("=[]|")
return
}
cp := make([]string, len(lst))
for i, s := range lst {
cp[i] = strings.TrimSpace(strings.ToLower(s))
}
sort.Strings(cp)
sb.WriteString(tag)
sb.WriteByte('=')
sb.WriteString(strings.Join(cp, ","))
sb.WriteByte('|')
}
writeList("domains", nsc.Domains)
writeList("expected", nsc.ExpectedIPs)
writeList("expect", nsc.ExpectIPs)
writeList("unexpected", nsc.UnexpectedIPs)
key := sb.String()
if id, ok := policyMap[key]; ok {
return id
}
id := nextPolicyID
nextPolicyID++
policyMap[key] = id
return id
}
for _, server := range c.Servers {
ns, err := server.Build()
if err != nil {
return nil, errors.New("failed to build nameserver").Base(err)
}
ns.PolicyID = buildPolicyID(server)
config.NameServer = append(config.NameServer, ns)
}

1
infra/conf/dns_test.go
View File

@ -74,6 +74,7 @@ func TestDNSConfigParsing(t *testing.T) {
},
ServeStale: true,
ServeExpiredTTL: &expectedServeExpiredTTL,
PolicyID: 1, // Servers with certain identical fields share this ID, incrementing starting from 1. See: Build PolicyID
},
},
StaticHosts: []*dns.Config_HostMapping{